Roll changer for printing presses



April'26, l932.v B. c. WHITE 1,855,503

Rom. CHANGER Eon PRINTING PRESSES Filed June 20, 1923 l 14 Sheets-Sheet1 e7-4' -JNVENTOR April k1932. B. c. WHITE ROLL CHANGER FOR PRINTINGPRESSES Filed June 20. 1923 Sheets-Sheet 2 A NVENTOR 2% 9%/ Q u M /5'ATTORNEYS Aprilzs, 1932. B, C, WHWE -1,855,503

ROLL CHANGER FOR PRINTING PRESSES I.

Filed June 2o,A 192s 14 sheets-sheet s /NVENTO B y @ma April 26, 1932 B.c. wHlTE ROLL CHANGER FOR PRINTING Pmjssrs` Filed June 2o, 192s 14sheets-sheet 4 INVENTOR i //S A TTORNEY April 26, 1932. B, C W|||TE A1,855,503V

ROLL QHANGER FOR PRINTING PRESSES Filed June 20, 1923 14 Sheets-Sheet 45INVENTOR April 26, 1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSESFiled June 20, 1923 .14 Sheets-Sheet 6 April 26, 1932. B C, WHlTE ROLLCHANGER FOR PRINTING PRESSES Filed June 2o. 192s 14 sheets-sheet 7 /NVENTOR m /f/s A TTORNE YS April 26, 1932. B. c. WHITE ROLL CHANGER FORPRINTING PRESSES Filed June 20, 192s 14 sheets-Sheet 8 April 26, 1932.B. c. WHITE l ROLL CHANGER FOR PRINTING PRESSES 14 Sheets-Sheet 9 FiledJune 20, 1923 /NVENTO By @ma @Offb/L @L mfg/grown Ys April 26, 1932. B.C, W|||TE 1,855,503

ROLL-CHANGER FOR PRINTING PRESSES Filed June 20, 1923 n 14 Sheets-sheetV1o INVENTOR //S ATTORNEY April 2s, 1932.

B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June`20, 1923 14Sheets-Sheet l1 /N VEN TO/e B. c. WHIT'E April 26, 1932.

ROLL CHANGER FOR PRINTING PRESSES,

Filed June 20, 1923 14 Sheets-Sheet l2 I I/Q April 26,'193'2. B. c.wH|TE' I 1,855,503

ROLL QHANGER FOR PRINTING PRESSES Filed June, 2o, 1923 14 sheets-sheet15 v n I y wwmwwwwwwwwwim [N VENTOR @ma @am l//S ATTORNE .April 26,1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June 20, `192314 Sheets-Sheet 14 fi l.

l Patented Apr. 26, 1932 UNITED STATES PATE-Nr OFFICE :muon c. WHITE, oFNEW YORK, N. Y., AssIGNoR., BY MESNE ASSIGNMENTS, To 12. non v AND co.,INC., oF NEW YORK, N. Y., A conPoRA'rroN oF NEW Yonx BOLL CHANGER. FORPRINTING PRESSES Y Application lel .Tune 20, 1923. Serial No. 646,592.

This invent-ion rela-tes to that class of printing presses wherein thepaper to be printed is in the form of webs drawn from rolls through themachine.

The principal objects of the invention are to facilitate Vthe supply ofthe rolls of paper and to insure the Webs of successive rolls'automatically assuming such connected relation that the paper from-aplurality of succeeding rolls will be fed to the printing machine in acontinuous `webw1thout necessarily involving the interruption of theprinting operation.

Another 'object of my invention is to provide improved means forspeeding up and controlling the speed of the fresh rolls, and the speedand stoppage of the expiring rolls independently.

Another object of my invention is to provide a simple, semi-automaticcontrol for the paster and web severing devices.

' Another object of my invention is to provide an automatic means formarking the particular folded papers or units of the product whichcontain the pasted or doubled portion of any web which goes to make upthe product. j y

Other objects of my invention are to pro'- vide roll-changer mechanismswhich can be fitted to a printing press in place of the usual` Fig. 2 isaside-elevation ofx the operating o'r front side of the rollchanger.

Fig. 3 is a side elevation of the driving or rear side of theroll-changer. l Fig. 41's a horizontal section on line 4--4 of Fig. 1.

` Fig. 5 is a horizontal-section on line 5- -5 of 5 Fig. 1.

Fig. 6 is a detail on a larger scale than that of the preceding figuresof the traction belts. FFig. 7 is a section of same on line 7-7 of Fig.8 is an enlarged section of the drivingshaft, pulley and journal bearingof the trac-A A tion device. f

Figs. 9 and 10 are details of the outer traction belt, pulleys andjournal bearings.

Fig. 11 is a detail section of the control cylinderl for the speed uptraction belt on line 1.1-11 of Fig. 121

Fig 12 is a side elevation partly in sectlonA along line 12-12 of Fig.11, showing the same parts as in Fig. 11.

Fig. 13 is a section on line 13-13 of Fig. 15 showing the reversibleroll holder drive.`

Fig. 14 is a verticalsection on line 14-14 of Fig. l5.

^ Fig. 15 is a horizontal section on line 15-15 of Fig.. 13. Y

Fig. A16 is a-detail section on line 16-16 of Fig. 17, showing theclutch control eccentrics. Fig. 17 is a side elevation of the clutchcontrol levers, which with the preceding four -figures relate to thetraction belt and roll holder drives. y

Fig. 18 is a horizontal section on line 18- 18 of Fig. 19 showing one ofthe roll holders. Fig. 19 is a vertical section on line 19-19of Fig. 20is a plan viewvpartlyl in section onv linie 18-18 of Fig. 19 and showinga half width roll of paper with its spindle.

Fig. 21 is a detail section of the roll holder online 21-21 of Fig. 22.-

Fig. 22 is a section of same on line 22-22 of Fig. 21. I

' Fig. 23 is a section of Fig. 24.

of same on line 23-23 Fig. 24 is a section of same on line 24L-24l A ofFig. 23.

Fig. 25 isa plan view of a full width paper roll showing the normalposition of the traction belts and pasted area of the fresh roll.-

Fig. 26 shows the position of a half width .roll of paper and itsspindle and pasted area when at one side of the center.

Fig. 27 shows the position of ahalf width roll of paper whenl centrallylocated, with a suitable spindle and pasted area.

Fig. 28 is a'plan view partly in section on line 28-28 of Fig. 30showing the paster and severing knife mechanism.

Fig. 29. is a fragmentary plan View of the marker for indicating theposition of the pasted papers in the product.

Fig. 30 is a vertical section of paster and its operating mechanism online 30-30 of Fig. 28.

Fig. 31 is a vertical section through the paster operating cylinder online '31-31 o'f Fig. 28.

Fig. 32 is a detail section on line 30-30 of Fig. 28, showing the markerabout to be moved into Contact with the paper and in line 36-36 of Fig.34.V i

Fig. 37 is a horizontal section showing in detail the frictional cut-odcoupling of the. traction belt drive and brake and is 'takenalong line37-37 of Fig. 38.

Fig. 38 is a detail of the clutch lever shown partly in section alongline 38-38 of Fig. 37. Fig. 39 is a detail view of a hoisting plug beinga section on line 39-39 of Fig. 40 and 'y as used witha roll centertube.

Fig. 40 is an end view of same.

Fig. 41 is a section of same on line 39-39 showing the hoisting plugused in connection with a roll spindle.

1Fig. 42 shows the plugs in use on a half ro l.

Fig. 43 is a diagrammatic partly sectional side elevation of theinvention as vused with a printing press.

. Similar numbers indicate like parts in all the figures.

In the embodiment of the inventions disclosed herein A indicates a lowerroll chang er, B a middle roll changer and C `a top roll changerapproximately as arranged. at the end of a three-web or sextupleprinting press.

1 indicates a base plate to which are bolted the upright front frame 2,and the upright rear frame 3, also the lower roll support 4.

The frames are tied together by means of the outer cross ties 5, themiddle cross ties 6 and the inner cross ties 7. To the outer cross ties5 are bolted extension brackets 8 for supporting temporarily the freshpaper rolls 9 which may be replaced thereon with the aid of a paper rollhoist of the usual type but not lshown. Likewiser a fresh roll 10 may belplaced upon the support 4.

. tate in the reelsby Considering now the lower-or A deck, a fresh roll11 has already been rolled inward suliiciently to be secured in therollholder 12, this roll holder being shown in the form of a pair ofspaced heads. n

Paper is generally Wound upon an iron pipe or core tube 13, see dottedlines in Figs. 4, 20 and 22. To support and center afresh roll of paperin the roll holders 12 having first properly positioned it, the taperplugs 14 are forced into both ends of the core tube 13 by means of thescrews 15 and hand-wheels 16 having their bearings in the plate 17 seeFigs. 18y and 22. A. traveling nut 18 having screw threaded engagementwith the screw l5 is secured fiXedly to thenut-plate 19. The latter isprovided with projecting lugs which are free to slide longitudinally inthe keyways 2O of the holes 21 bored through the heads on opposite sidesthereof and near their periphery. Preferably antifriction ball bearings22 and 23 are introduced to carry the weight and endwise thrustsustained by the taper plugs 14 which latter are free to rothe rotationof the paper rolls.

,The heads 12 are ournalled upon the nonrotating centers 24 and are heldagainst endwise movement thereon by means of the flange 25 andk collarplate 26. The reel centers 24 are fitted to slide freely endwise in thehubs 27 projecting inward from the frames 2 and 3, but are preventedfrom rotating therein by the key plug 28, the latted inner end of whichhas sliding engagement in the keyway 29 of the center, thus leaving thelatter free to lbe 'moved endwise in the frame hubs by means of thescrew 30 to which is secured the hand wheel 31. e

A .sprocket wheel 32 is also secured to the screw 30 and 'has a sprocketchain 33 trained about it and also about a sprocket 34 on each end ofaoshaft 35, see Fig. 4. By this means the operator in turning eitherofthe hand wheels 31 will rotate both screws 30 in the same direction ina manner to screw both centers 24 and consequently both heads and therolls of paper mounted therein either to the right or left, as may bedesired, in order to properly introduce the web into the print,- tinelements ofpthe press. The screw 30 has its. caring in aplate 36.

The heads 12 are preferably adjusted to give only` suliicient space forthe introduction of the paper rolls between them, which latter are ofuniform size, hence may be readily positioned and centered. Tofacilitate the correct placing of the rolls small anti-friction rollers37 are let into suitable recesses in the rollsupport4 and outercross-ties 5 whereby the fresh roll may be moved easily to the right orleft as required. These rollers 37 are utilized to remove the exhaustedrolls laterally from the machine, as will be more fully explained.

The heads 12 are provided with heavy spur gears and are provided withexternal gearteeth which mesh into toothed pinions 38 keyed to thepinion shaft 39. To the latter is keyed a worm wheel 40. Bearings 41upon the inner cross tie 7 support the shaft 39, which latter is furthersupported in a journal 42 in the gear box 43, see Fig. 4.

A vertical worm shaft 44 having a worm 45 formed thereon is journalledin bearings 46'and 47. The worm shaft 44 is provided with feathers 48upon which the double leather faced cone 49 is free to slide vertically.A split collar 50 is clamped into a groove in j the said double cone inwhich it is fr'ee to.

turn. The split 'collar is held from rotation by the stud 51. The splitcollar is linked to an eccentric shaft 52," journalled in the cap 53 bylinks 54. The links engage projecting trumiions 55 on the split collarand eccentric projections 56 on the shaft 52. The latter is rotated by acurved arm 57 which in turn is connected by a link 5 8 to one `arm 59 ofa bell crank 60. The latter. is journalled upon a stud 61 and itsdepending arm 62 is connected by a rod 63 to the operating or front sideof the machine.

The arm 57 is notched for a spring 64, see

Fig. 14, which tends to hold said arm in any one of three positions, onerepresenting the clutch cone forced upward, one representing it forceddownward and one in a middle position.

Above and below the double cone clutch .35 are spurgears 65 and 66having internal surfaces corresponding with the conical surfaces of thedouble cone clutch. Said gears are provided with collars 67 to preventtheir endwise Amovement on the worm shaft upon which they are both freeto turn.

68 is a vertical driving shaft to which is secured a pinion 69 whichlatter meshes into the lower cone gear 66 and also into an intermediategear 70 upon the shaft 71. The gear 70 also meshes into the upper conegear 65 whereby the lower cone gear 66 being driven' direct from theshaft 68 will rotate in one direction, while the upper cone gear 65being driven through an intermediate gear 70 will rotate in the oppositedirection. It follows that if the double cone 49 is thrust up'- ward toengage the gear 65 the worm will be rotated in one direction while ifthe double cone is forced downward -to engage gear 66 the worm will berotated in the opposite direction. If the double clutch cone is retainedin mid-position it will be out of contact with both gears and will notrotate but will hold the worm gear`40, and pinions 38 from rotation andhence lock the. heads 12 in any position desired. The gearing justdescribed is preferably enclosed in the gear box 43.

The vertical driving shaft 68 is keyed into a bevel gear 72 which mesheswith the bevel gear 73, keyed to the shaft 74 which is journalled inbearing 75. The shaft 74 is keyed into the spur gear 76 which in turn isdriven by the spur gear 77 keyed to the way-shaft 78 of the printingpress. Suitable bearings 79 are provided for the way-shaft. Bevel gears80 mesh with and drive pinions 81 upon the shafts 82 one foreach deck.Chain sprockets 83 upon the shafts 82 drive through the pitch chains 84the chain sprockets 85 secured to the shafts 86. Both the shafts 82 andthe shafts 86 are preferably mounted in ball bearings. Both shaftsterminate invone element ofthe friction cut-off couplin 87 and 88 whichlatter are driven in one irection at a speed corresponding with that ofthe web.

Extendingacross the machine from the cut-off couplings are two pulleyshafts 89 and 90 foreach deck to which are secured the other frictionelements of the cut-off couplings. When the friction elements of thesaid couplings are brought into contact by means of the clutch levers 91and.. 92 the shafts 89 and 90 will partake of th'e rotation of theshafts 82 and 86 or either of them. Rods 93 and 94 extend from theclutch levers to the operating or front side ofthe machine.

Uponthe shafts 89 and 90 are fixedly secured pulleys 95 and 96.Swinging' frames 97 and 98 are .journalled in the rail pieces 99 andbracket 100 concentric with the journals of the sh afts 89 or 90, whichlatter journals are made preferably in the form of ball bearings. Theswinging frames-97 and 98 carry pulleys lOland 102 which run freely upontheir shafts 103 or 104, preferably with ball bearing journals thereon.Said shafts are mounted in adjustable end blocks 106 provided withadjusting screws 106', whereby tension of the belts 500 trained aboutthe pulleys 95 to 101 and the belts 501 about the pulleys 96 to 102 maybe adjusted.

The outer swinging frame 98 is connected by links 105 to arms 106" keyedto the shaft 107, see Fig. 7. The latter is journalled in the railpieces 99 and also in the front frame 2 through which it projects andhas keyed to ita segment gear 108; Meshing with the segment gear is arack-bar 109 which forms, as it extends downward, the piston-rod o adouble acting air cylinder 110. At the lower j end of this rod issecured a piston fitted to slide freely in said cylinder. The usualcylinder heads 111 and 112, with stuffing box 113, and air pipes 114with a 4-way valve 115 complete this device, which is designed to raiseand lower the pulley frame 98 to lift it bodily out of the path of ytheincoming fresh roll, or to lower the traction belt into contactwith saidroll'to cause itto rotate and to follow its surface as it unwinds itsweb and reduces its diameter, also to follow it as itis moved upward andinward toward its expiring position, as shown in the relative positionof the parts onzthe B deck, Fig. 1.

The inner clutch cut-off coupling 87,

which, drives the inner traction pulleys 95, is operated through theclutch rod 93 and clutch lever 91. The latter is provided with an arm116, formed and adapted to bear against the outside surface of clutch87, and to act thereon as a friction brake, to quickly stop the shaft 89when the clutch is released, utilizing the clutch releasing movement ofrod 93 to apply the brake 116 as shown in Figs. 37 and 38.

' The clutch rod 93 is operated by a handle 117, acting between collars118 on said rod. The handle 117 may be moved by rthe operator to stop orstart the inner traction belts. Additional and automatic means areprovided for disconnecting the clutch coupling 87 and applying the brakethereto consisting in a downwardly extending cam-shaped part 119 of thehandle 117, in the path of a roller 120, mounted in a forked bearing 121secured to the inner face of a swinging arm 122, see Figs. 34, 35 and36. These parts are so arranged that when the arm is in the positionshown in full lines in Fig. 34, the handle may be moved in either'direction. When the arm 122 is lowered to the position shown in`dottedline in Fig. 34, the roller 120 will force the lower end of lever 117inward, thus pulling the rod 93 outward to release the clutch and setthe brake 116. The

lever 122 is keyed to the pastel shaft 123, which latter extends acrossthe machine and is j ournalled in bearings 124 secured to crosstie 7.Keyed to the shaft 123 are arms 125 which latter have projecting lugs126. These lugs are adapted to engage corresponding lugs 127 formed uponand projecting inwardly from the pasting arms 128.

Extending between the pasting arms is a pasting roller 129 preferablymounted to run up n ball-bearings upon the non-rotatingy .the contact oftheir 'lugs 126 and 127 they may be raised and lowered without affectingthe relative position of the knife 133. Vlien the pastirig roller 130 islowered to meet the fresh paper roll as in deck A Fig. 1 the arms 128will stop; Any further rotationof the shaft 123 will continue to swingthe arms 125 rearwardly and with them the rods 135 and arms 134, thusturning the square shaft 131, whose pivots are now stationary, in amanner to swing the knife 133 into and across the path of the web 137and sever the same. The

-in dotted lines in Fig. 30 and as shown in deck B. Fig. 1 up out of theway of the paper roll.

It is not expected nor intended that the' paster roller shall apply theweb from the eX- piring roll to the surface of the fresh roll with anyreference to the angular position of the' pasted area upon the latter,as the rapid rotation of the fresh roll when making a paste at fullspeed'would make such timing impractical. Any automatic device fortiming the pasting movement to the pasted area s likewise `complicatedand unsatisfactory due to the high speed and variation in the diameterof the fresh rolls, I preferably make the pasting movement regardless ofthe position of the pasted place upon the fresh roll and delay thecutting off of the web from the expiring roll until the fresh-roll hasmade one revolution, thus insuring a proper paste. To accomplish this itis necessary to retard the swing of the knife into the web path which,as has been described, is effected by the final downward movement of thelever This lever 122 is actuated by a double actwith a valve 150, andanother by-pass pipe with its valve 151, whereby the descent of thepiston 148 to the level of the valve 151 may be relatively rapid,depending upon the opening of the valve 151, after which the descent maybe as slow as desired, depending upon the opening of valve 150. Thislatter movement corresponds with that part of the turning of the shaft123 after the ,roller 130 has met the paper roll and while the knife 133is being swung `downward and into the path of the web, and is timed tocorrespond with one revolution of the paper roll. This vensures that thepasting will occur before the web from the expiring roll has beensevered, regardless of the angular-position of the pasted place upon thefresh roll. The operator need only turn the 4-way valve 146 to effectthe pasting or roll change, `when the succeeding movements will beeffected in their proper sequence and with the proper intervals betweenthem. When the pasting and web severing have been accomplished, the4-way Valve 146 will be reversed and the piston will lil rise and withit the pasting roller and knife to the positions shown in decks B or C,there to remain out of the way until another fresh roll is to beconnected to the running web,

when the operation is repeated. The descent of the lever 122 as -alreadydescribed throws the friction clutch 87 out of engagement and appliesthe brake 116 thereto, to quickly stop the expiring roll from furtherunwinding lo after its web has been severed.

Heretofore when renewing rolls, the practice has been to stop the press.lWhile the press speed is being retarded to the stopping point, or isbeingv accelerated from a standstill to full speed, the product isgenerally improperly folded and otherwise defective and is removed fromthe delivery belt and rejected. The number. of papers lost for each suchstoppage or interruption of the printing 2o operation is considerable.To reduce this wastage, Ait is necessary not only to maintain printinofspeed while renewing the'rolls on any dec but also to make somedistinguishing mark upon the folded copies of the product which willidentify them as containing the pasted or doubled web from one of theseveral rolls of paper from which the product is made. Such markedcopies will preferably be marked upon the margin of the out-l side page,in chalk or marking pencil upon a few copies in advance of and followingthe pasted place, limiting the copies so marked to the smallestpractical number.

To accomplish this result, I utilize the movement of the arms 125 by'forming upon one of them a lug 152, provided with a catchplate 153,which latten is adapted to engage a hook-plate 154 secured to thesliding block 155 upon the rod 156. An upwardly yielding `s ring 157acting against aY collar 158 upon t A, rod 156 permits the sliding blockto .centinue its upward movement after the rod 1576 has reached thelimit of its upward movement. The rod 156 is pivotally connected to amarking lever 159 fulcrumed upon apivotpin 160 and carrying a markingpencil or crayon 161. This crayon 161 is brought into Contact with therunning web atabout the time that' the roller 130 meets the fresh roll,and will therefore begin to make a mark 165 on the web in advance of thepasted place and will continue to mark the -web until it is severed orlater, depending upon the time when the catch-plate 153 unhooksA orreleases the hookplate 154 in its upward movement. The main purpose ofthe marking of the web is to distinguish the copies containing thepaste, rather than to c'ountoif any particular numo ator wi quicklylearn how many copies to 5 justably secured to the arm 159 and preferberof cplpies following'the paste,l as the opering operation.

ably bears upon the web as it passes over an idle running carrier roller163.

Obviously the marking of the web may be done `in ink or pigment, with apen, brush or roller, or dripped or sprayed upon or otherwise marked, ortheweb may be cut or torn or otherwise mutilated to renderdistinguishable the marked copies of the product as they advance uponthe delivery.

The marking of the web may be done at any ,desired point in the printingoperation between the pasting and delivery, or upon the deliveryitselfand may be applied upon either side of any web and upon eithermargin thereof to make it distinguishable on the product.

The devices included in the pasting, sever- Ving and marking mechanismsand their pneumatic control are similarffor the three decks except thatthe marking lever and crayon are only applied to the web which will beat the outside of the folded product. There will be the same lugs 152,sliding blocks 155 and springs 157 for all decks, but the rods 164 and165 will extend from the three different -90 `arms 125 to thecommon`lever-159 so that a pasting movement at any of the three deckswill similarly mark the selected web. As the movements of thecatch-plates are lifting actions only, against the lever 159 it follows95 that there will be no interference between them even though thepasting should occurl simultaneously upon all three decks. In thisdevice it is assumed that the lineal distance along each run of web fromthe paster roll to the point at which the various webs are associated ispractically the same. Small differences may be disregarded, butdifferences greater than can be compensated for within the range of thevarious adjustments, would obviously require a duplication or triplica-`tion 4of the marker applied at different points to the selected web inorder to properly locate the pasted places.

' The outside pages are always printed from full width rolls hence themarking device above described when once attached and connected need notbe disturbed. Half width rolls are frequently used for printing what istermed a. dinkey sheet. The web from the latter is pasted and severed inthe same manner as full width webs and would' therefore mark the placeof. its pasting upon the outside or selected web.

The web running from the expiring roll 112 passes around the pastingroller 130 and I thence over the free running roller 166. The directionof these web-runs is `so arranged in relation to the arc or path ofmovement of the roller 130 that the web will be neither 125 stressed norslackened by such roller movement in either direction, thereby avoiding"web breakage, or slip and failure of the past- The exhausted roll, afterits web been 13o engagement the roll holder drive and turnsl the rollholder to the position shown in deck B, having v first started thetension belt drive through the clutch 87. The tension frame 98 may nowbe swung outward and upward to the position shown in C deck and stoppedby throwing out the clutch 88.

'lln the position shown in B deck the ex# hausted roll llfhas been movedsomewhat forward of its lowest position and the running roll is somewhatbeyond its uppermost position. At this time the reel is stopped and thecentering plugs 14 in the exhausted roll are withdrawn by backing thehand wheels 16. rlhe exhausted roll will now. fall out of place and uponthe hinged rail sections 167, which are adjustably sustained by theeccentrics 168, which latter are keyed to the shaft 169, journalled inthe rails 99 and are adjustable by a wrench from` the front at 170; Bythis arrangement the exhausted rolls may be of varying diameters,dependent upon the condition of the pape/1` near the center of the rolland the hinged section of the rails or track may be raised to meet theexhausted roll. The fall of the latter is avoided or softened and theoutward inclination of the track starts the roll outward, see deck B,Fig. 1. The exhausted roll now rolls or is rolled outward upon the track99 until it is upon the rollers 37, whose top surfaces form acontinuation of tracks 99. f a

F rom this position the exhausted roll may be pushed to one side and outof the way of incoming rolls, suitable roller brackets being providedforthem at each deck level not shown or the exhausted rolls may belowered 4 by the same hoisting device which originalon the drawings.

The hinged rail-sections also serve to act as stops to the incomingfresh roll. The latter having been deposited upon the bed extension 4 orthe bracket 8 and the exhausted roll having been disposed of, the freshroll is so placed and the heads are so adjusted in angular position thatthe taper plugs 14 may be forced into the central tube of the roll atboth ends thereof. By causing the roll holder now to turn a shortdistance, the roll is lifted and is free to revolve. 4

The outer traction belt has already'been described as pocketed up out ofthe way of be. With the outside layer gone or damaged the pastingoperation is generally rendered impossible.

When the traction belts are applied with considerable pressure to therolls before the belts are started, it is found that by introducinga'suitable and sensitive friction clutch coupling into the traction-beltdrive, the rolls may be started gently and with no damage to the outsidelayer of paper thereon and with gradual and uniform increase in/speedthe inertia of the roll is overcome completely and the speed may bebrought to correspond with the web speed. As there is no slipping of thebelts upon the paper roll, it follows that the belts may be rubber orother material having a high coefcient o f friction and may be forcedagainst the paper with high pressure and belt grease may be applied tothe belts both inside and out to increase their friction;

Multiple disk clutches are used preferably as being more sensitive andgentler in starting than other types. This arrangement of belt drivealso offers advantages in giving a surer control of the roll speed whenthe press is suddenly stopped or started, after the fresh roll has beenspeeded. up and the clutch is carrying its full load, as the fresh rollresponds to every change in speed of the press and does not run aheadand unwind when the press stops, nor does it lag behind when the pressstarts, thereby tending to break the web. y

The friction clutch cou ling is introduced into the speed-up drive orsafe and gentle starting and reliable speed-control of the `fresh roll.The friction clutch coupling is introduced into the drive of thetraction belts of the expiring roll to continue this control and affordmeans for a quick stop of the latter after severing the web. Thistwo-traction-belt arrangement gives the operator continuous control ofthe rolls from the time the fresh roll, first begins to revolve until itis cut ofi:` and stopped, which control he can not have with anysingle-traction-belt, as the latter can not act upon two paper rolls atthe same time successfully.

25 shows a paper roll of the usual proportions for printing 4 pages inwidth. For such a width, two pairs of traction belts Afor both thespeed-up and slow-down would be used instead of one, as shown in theother ilo

